// 下面两个package要单独安装
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

export default{
  install (Vue, options) {
    Vue.prototype.getPdf = function (id,title) {
      html2Canvas(document.querySelector(`#${id}`), {
        // allowTaint: true
        useCORS:true//看情况选用上面还是下面的，
      }).then(function (canvas) {
            let contentWidth = canvas.width
            let contentHeight = canvas.height
            let pageHeight = contentWidth / 592.28 * 841.89
            let leftHeight = contentHeight
            let position = 0
            let imgWidth = 595.28
            let imgHeight = 592.28 / contentWidth * contentHeight
            let pageData = canvas.toDataURL('image/jpeg', 1.0)
            let PDF = new JsPDF('', 'pt', 'a4')
            if (leftHeight < pageHeight) {
                PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
            } else {
            while (leftHeight > 0) {
                  PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
                  leftHeight -= pageHeight
                  position -= 841.89
                  if (leftHeight > 0) {
                      PDF.addPage()
                  }
              }
            }
            PDF.save(title + '.pdf')
        }
      )
    }
  }
}